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Iran now has all the technical infrastructure to produce nuclear weapons should it make the political decision to do, Director of National Intelligence James Clapper wrote in a report to a Senate intelligence committee published Wednesday. However, he added, it could not break out to the bomb without being detected.

In the “US Intelligence Worldwide Threat Assessment,” delivered to the Senate Select Committee on Intelligence, Clapper reported that Tehran has made significant advances recently in its nuclear program to the point where it could produce and deliver nuclear bombs should it be so inclined.

“Tehran has made technical progress in a number of areas — including uranium enrichment, nuclear reactors, and ballistic missiles — from which it could draw if it decided to build missile-deliverable nuclear weapons,” Clapper wrote. “These technical advancements strengthen our assessment that Iran has the scientific, technical, and industrial capacity to eventually produce nuclear weapons. This makes the central issue its political will to do so.”

In the past year alone, the report states, Iran has enhanced its centrifuge designs, increased the number of centrifuges, and amassed a larger quantity of low-enriched uranium hexafluoride. These advancements have placed Iran in a better position to produce weapons-grade uranium.

“Despite this progress, we assess that Iran would not be able to divert safeguarded material and produce enough WGU [weapons grade uranium] for a weapon before such activity would be discovered,” he wrote.

He said the increased supervision and other “transparency” to which Iran has agreed under the new interim deal, reached with the world powers in Geneva in November and finalized last week, could offer earlier warning of a breakout to the bomb. Should Iran cooperate with the interim deal, halt enrichment, and “provide transparency,” then “This transparency would provide earlier warning of a breakout using these facilities.”

Clapper told the Senate committee that the interim deal will have an impact on Iran’s nuclear weapons program’s progress and “gets at the key thing we’re interested in and most concerned about,” namely, Iran’s 20 percent enriched uranium.

Iran had also worked hard to advance its program at the Arak heavy water facility, wrote Clapper. Its ballistic missiles, he noted, of which it has “the largest inventory in the Middle East,” are “inherently capable of delivering WMD.” And its space program gives it the means to develop longer-range missiles, including intercontinental ballistic missiles.

“We do not know if Iran will eventually decide to build nuclear weapons,” Clapper wrote. But he noted that Iran’s overarching “strategic goals” were leading it to pursue the capability to do so.

The national intelligence director reiterated that imposing additional sanctions against Iran would be “counterproductive” and would “jeopardize the [interim] agreement.” He advised that additional sanctions against the Islamic Republic should only be kept “in reserve.”

“This agreement merely set Iran back six weeks — no more — according to our assessments, in relation to its previous position, so that the test, as to denying Iran the ability to manufacture nuclear weapons, has been and remains the permanent agreement, if such [a deal] can indeed be achieved,” Netanyahu said at a conference of the Institute for National Security Studies in Tel Aviv.

Last Wednesday, Foreign Minister Mohammad Javad Zarif accused the Obama administration of mischaracterizing the terms of an interim nuclear deal. “We did not agree to dismantle anything,” Zarif told CNN.

Zarif repeated that “we are not dismantling any centrifuges, we’re not dismantling any equipment, we’re simply not producing, not enriching [uranium] over 5%.”

The six-month deal freezes key aspects of Iran’s nuclear program, while allowing limited enrichment to continue, in exchange for some economic sanctions relief. It went into effect on January 20.

The next round of international nuclear negotiations with Iran is expected to be held in New York next month, according to officials involved in the planning.

Israel has threatened to attack Iran should it not back off from its alleged pursuit of a military nuclear capability.

On Tuesday, UN nuclear inspectors arrived in Tehran to visit Iran’s Gachin uranium mine for the first time in several years, Iran’s Atomic Energy Organization spokesman Behrouz Kamalvandi said. The visit was part of the framework of a separate deal between Iran and the International Atomic Energy Agency in November.